-90=-10-4n

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Solution for -90=-10-4n equation: 



-90=-10-4n

We move all terms to the left:

-90-(-10-4n)=0

We add all the numbers together, and all the variables

-(-4n-10)-90=0

We get rid of parentheses

4n+10-90=0

We add all the numbers together, and all the variables

4n-80=0

We move all terms containing n to the left, all other terms to the right

4n=80

n=80/4

n=20

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